Retracing the life of X-ray binaries to find their birthplace is a mean to constrain their evolutionary paths as it provides insights on their formation mechanisms, as well as on their evolution timescales, which can be very different from isolated stellar evolution mostly due to mass transfer. In the case of HMXBs, one would expect them to be formed in the same place as the general population of massive OB stars, i.e. young clusters of stars or Galactic spiral arms, since at least the primary star should be massive [1]}. However, massive star formation is not necessarily tied to associations or spiral arms, as there are examples of them being born isolated from such Galactic structures (see e.g. [2]} [2]}).
